The crockpot/antifreese is a nobrainer, put the parts in, let them simmer for 24hr, they come out shiney new. Use an old tooth brush for the tough spots.
Here are a few posts about it, you'll never use anything else again:
http://www.rcuniverse.com/showthread...and+antifreeze
http://www.rcuniverse.com/showthread...and+antifreeze
http://www.rcuniverse.com/showthread...and+antifreeze
http://www.rcuniverse.com/showthread...and+antifreeze]